preposition

Common English prepositions like 'in', 'on', and 'at' are often difficult for learners to master.

(Chinese) 像'in'、'on'和'at'这样常用的英语介词对学习者来说往往很难掌握。

A preposition links a noun to another part of the sentence to show location.

(Chinese) 介词将名词与句子的另一部分连接起来以表示位置。